A MOPA laser system that includes a seed laser configured to output pulsed laser light, an amplifier configured to receive and amplify the pulsed laser light emitted by the seed laser; and a pump laser configured to deliver a pump laser beam to both the seed laser and the amplifier and a variable attenuator configured to eliminate missing Q-switched pulses.

A frequency-doubled laser, including: a first reflecting mirror, a second reflecting mirror, a gain medium, a telescope module, a polarizing element, and a nonlinear crystal; the first reflecting mirror and the second reflecting mirror are spaced apart to form a resonator of the frequency-doubled laser; the polarizing element, the gain medium, the telescope module, and the nonlinear crystal are located in the resonator, and the telescope module is located between the gain medium and the nonlinear crystal. The present disclosure further provides a method of generating harmonic laser. The frequency-doubled laser and the method of generating harmonic laser make the position of nonlinear crystal more flexible, and the possibility of damage to the nonlinear crystal is reduced.

There is provided a photoacoustic measurement apparatus including a laser light source unit that has a flash lamp for emitting excitation light and a laser rod for emitting laser light in response to incidence of the excitation light, an excitation light source power supply unit that has a capacitor bank for supplying a voltage to the flash lamp, an IGBT for controlling an output of the voltage charged in the capacitor bank to the flash lamp, a discharge control circuit for generating a driving pulse for driving the IGBT, and a pulse width limiting circuit for limiting a pulse width of the driving pulse output from the discharge control circuit, the pulse width limiting circuit being formed of a passive element, and a photoacoustic wave detection unit that detects photoacoustic waves generated inside a subject by emission of light emitted from the laser light source unit to the subject.

The present invention describes a device for assessing and providing quality feedback on thoracic compressions during cardiopulmonary resuscitation, which allows for an optimal assessment of the quality of the thoracic compressions made during cardiopulmonary resuscitation, which provides feedback on the position of said compressions. The device for assessing and providing quality feedback on thoracic compressions during cardiopulmonary resuscitation, by means of the elements thereof together with essential technical features thereof, such as an infrared sensor, a microprocessor, logic means, a graphic interface and remote connectivity means, makes it possible to estimate the depth and frequency parameters of the thoracic compressions, in order to determine whether they are adequate during a cardiopulmonary resuscitation procedure.

A laser system may include a laser resonator configured to emit an input laser beam having an elliptical cross-sectional shape. The laser system also may include first reflective device configured to reflect the input laser beam to produce a first reflected laser beam. The first reflective device may include a spherical surface for reflecting the input laser beam. The laser system also may include a second reflective device configured to reflect the first reflected laser beam to produce a second reflected laser beam. The laser system also may include a coupling device configured to focus the second reflected laser beam to produce an output laser beam. The coupling device may include a spherical surface for receiving the second reflected laser beam. The laser system also may include an optic fiber configured to transmit the output laser beam for emission of the output laser beam onto a target area.

A multilayer mirror, ring laser gyroscope and method are disclosed. For example, the multilayer mirror includes a plurality of alternating layers of a high index of refraction optical material and a low index of refraction optical material, an amplification layer of an optical material disposed on the plurality of alternating layers, and a coating of an anti-reflective material disposed on an outermost surface of the optical material amplification layer.

A Laser system is disclosed which comprises a pump, wherein the laser system is adapted to be operated in pulsed operation so that at least one individual pulse of a temporally limited pulse duration (T.sub.0) is generated, wherein the pulse ablates a material such that a debris cloud forms above the ablated material. Further, the pump power of the pump is modulated in such a way that the following three conditions are fulfilled: (1) the intensity of the pulse oscillates between maximum values and minimum values during the pulse duration, wherein the laser pulse comprises a plurality of intensity maxima I.sub.max which occur at times {T.sub.i, i=1, . . . N}; and a plurality of intensity minima I.sub.min which occur at times {t.sub.k, k=1, . . . (N1)}, wherein the intensity does not vanish at the intensity minima; (2) the intensity oscillations of the laser pulse induce oscillations of the size of the debris cloud so that, during the pulse duration (T.sub.0), there are at least two maxima of the size of the debris cloud which occur at times {T.sub.j, j=1, . . . M} and which are located in between two intensity maxima of the laser pulse; and (3) at least 70 percent of the maxima of the size of the debris cloud occur near an intensity minimum of the pulse such that, for at least 70 percent of the maxima of the size of the debris cloud, the intensity of the pulse I(T.sub.j) at the time of the maximum of the size of the debris cloud is smaller than I.sub.min(t.sub.k)+0.5[I.sub.max(T.sub.i)I.sub.min(t.sub.k)], wherein I.sub.min(t.sub.k) is the intensity minimum of the pulse which is closest to the maximum of the size of the debris cloud at time T.sub.j and I.sub.max(T.sub.i) is the intensity maximum of the pulse which is closest to the maximum of the size of the debris cloud at time T.sub.j.

A Laser system is disclosed which comprises a pump, wherein the laser system is adapted to be operated in pulsed operation so that at least one individual pulse of a temporally limited pulse duration (T.sub.0) is generated, wherein the pulse ablates a material such that a debris cloud forms above the ablated material. Further, the pump power of the pump is modulated in such a way that the following three conditions are fulfilled: (1) the intensity of the pulse oscillates between maximum values and minimum values during the pulse duration, wherein the laser pulse comprises a plurality of intensity maxima I.sub.max which occur at times {T.sub.i, i=1, . . . N}; and a plurality of intensity minima I.sub.min which occur at times {t.sub.k, k=1, . . . (N1)}, wherein the intensity does not vanish at the intensity minima; (2) the intensity oscillations of the laser pulse induce oscillations of the size of the debris cloud so that, during the pulse duration (T.sub.0), there are at least two maxima of the size of the debris cloud which occur at times {T.sub.j, j=1, . . . M} and which are located in between two intensity maxima of the laser pulse; and (3) at least 70 percent of the maxima of the size of the debris cloud occur near an intensity minimum of the pulse such that, for at least 70 percent of the maxima of the size of the debris cloud, the intensity of the pulse I(T.sub.j) at the time of the maximum of the size of the debris cloud is smaller than I.sub.min(t.sub.k)+0.5[I.sub.max(T.sub.i)I.sub.min(t.sub.k)], wherein I.sub.min(t.sub.k) is the intensity minimum of the pulse which is closest to the maximum of the size of the debris cloud at time T.sub.j and I.sub.max(T.sub.i) is the intensity maximum of the pulse which is closest to the maximum of the size of the debris cloud at time T.sub.j.

A method of treating pigmented lesions and vascular lesions by a wavelength between 500 nm and 600 nm applied to the segment of skin as a train of pulses. In some examples, a wavelength of 1048 nm is applied sequentially or simultaneously with the wavelength between 500 nm and 600 nm. Disclosed is also an apparatus supporting such skin treatment.

A method of treating pigmented lesions and vascular lesions by a wavelength between 500 nm and 600 nm applied to the segment of skin as a train of pulses. In some examples, a wavelength of 1048 nm is applied sequentially or simultaneously with the wavelength between 500 nm and 600 nm. Disclosed is also an apparatus supporting such skin treatment.